2+1味格点量子色动力学静态极限下的底强子质量分裂
Bottom hadron mass splittings in the static limit from 2+1 flavour lattice QCD
摘要：
用动态2+1味格点量子色动力学计算了含有单个静态重夸克和畴壁轻夸克及奇异夸克的介子和重子的质量分裂。我们的计算是基于RBC和UKQCD合作产生的动力学畴壁规范场组态，空间体积为（2.7 fm）^[3]，夸克质量范围最轻的值对应于（部分猝灭的）275 MeV的π介子质量。当外推到轻夸克质量的物理值时，我们的计算结果通常与底部扇区的实验测定结果很好地一致。然而，欧米茄_b^-重子和其他底强子之间的静态极限分裂倾向于稍微低估了使用最近的欧米茄_b^-的D-零测量所获得的结果。
英文摘要：
Dynamical 2+1 flavour lattice QCD is used to calculate the splittings between the masses of mesons and baryons containing a single static heavy quark and domain-wall light and strange quarks. Our calculations are based on the dynamical domain-wall gauge field configurations generated by the RBC and UKQCD collaborations at a spatial volume of (2.7 fm)^3 and a range of quark masses with a lightest value corresponding to a (partially-quenched) pion mass of 275 MeV. When extrapolated to the physical values of the light quark masses, the results of our calculations are generally in good agreement with experimental determinations in the bottom sector. However, the static limit splittings between the Omega_b^- baryon and other bottom hadrons tend to slightly underestimate those obtained using the recent D-zero measurement of the Omega_b^-.
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